[R] nlme and start=list()

Andrew Beckerman a.p.beckerman at stir.ac.uk
Fri Nov 22 18:29:29 CET 2002

Dear Listers -

R1.61 on NT

We are trying to fit a polynomial usning nlme so that in ax^2+bx+c, c is 
fixed and a and b are random.

The data are
Frames = speed of flight (20-50)
Manlength = tail length (-20,0)
ID = individual (14 of them)

each individual has experienced each of 6 tail lengths in the range above 
and we are interested in the shape of the relationship between speed and 

using the following approach based on the Venables and Ripley (3rd ed) 
examples with the Sitka data set

+ fixed=list(c~1),random=a+b~1|ID,
+ start=list(fixed=c(0.3,6,50)))

Error in nlme.formula(Frames ~ a * Manlength^2 + b * Manlength + c, fixed = 
list(c ~  :
         starting values for the fixed component are not the correct length

-realizing that something is wrong with how we have framed the start 
values... can anyone advise?


Dr. Andrew Beckerman
Institute of Biological Science
University of Stirling
Stirling FK9 4LA
+44 (0)1786 then wk-467808 fx-464994
(APB is not responsible for anything below this)

The University of Stirling is a university established in Scotland by
charter at Stirling, FK9 4LA.  Privileged/Confidential Information may
be contained in this message.  If you are not the addressee indicated
in this message (or responsible for delivery of the message to such
person), you may not disclose, copy or deliver this message to anyone
and any action taken or omitted to be taken in reliance on it, is
prohibited and may be unlawful.  In such case, you should destroy this
message and kindly notify the sender by reply email.  Please advise
immediately if you or your employer do not consent to Internet email
for messages of this kind.  Opinions, conclusions and other
information in this message that do not relate to the official
business of the University of Stirling shall be understood as neither
given nor endorsed by it.

r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch

More information about the R-help mailing list